1. APPLICATION
The conductive measuring principle can be applied to liquids with specic conductivity over
10 μS/cm. The switching unit can sense the resistance between probes. Conductivity measure-
ment is suitable only for detecting the presence of liquid at a given level of the tank. This level
is represented by the length of the probe.
The level switch consists of a NIVOCONT KRK–622– type switching unit and the
KLN–2 type probes selected according to the task. Probes are to be connected to the
NIVOCONT KS– 0 type probe socket head that can be screwed into the tank.
If the material of the tank or its internal insulation is not conductive then a reference probe
should be used in addition to the one, two, three or four probe(s), if the material of the tank is
conductive, the tank can be used as a reference probe.
The conductive switch is suitable for lling-emptying control with 2 relay outputs working simul-
taneously or for level detection of 2 independent levels (in 1 or 2 tanks) with 2 independent relay
outputs. More level switches can also be used with one common reference probe ‘C’ using any
combination of multiple-probe and single-probe socket.
2. TECHNICAL DATA
2.1 GENERAL DATA
2.1.1 Switch
KRK–622–1, –2 KRK–622–4
Probe voltage max. 3.5 V AC
Probe current < 1 mA AC
Sensitivity Adjustable: 5…100 kΩ
Max. cable capacitance
800 nF (sensitivity 5 kΩ)
100 nF (sensitivity 100 kΩ)
Response time max. 400 ms
Mechanical accuracy ±5%
Delay Adjustable: 0.5…10 s
Relay output 2× SPDT
Switching voltage 250 V AC1, 24 V DC
Switching current 16 A AC1
Switching power 4000 VA AC1, 384 W DC
Min. output power DC 4 kV (power – output)
Mechanical life-span 3 × 10
7
switches
Electrical life-span 0.7 × 10
5
switches
Power supply U
n
230 V or 110 V AC 24 V AC/DC
Galvanically separated (AC 50/60 Hz)
Voltage range allowed Nominal voltage –15%…+10%
Power consumption
2.5 W / 5 VA (230 V AC, 110 V AC),
1.4 W / 2 VA (24 V AC/DC)
Ambient temperature –20…+55 °C
(–4…+131 °F)
Electrical connection max. 2.5 mm
2
(AWG14)
Overvoltage category II
Pollution degree 2
Electrical protection Class II Class III
Ingress protection IP20
Mechanical connection DIN EN 60715 rail
Weight 248 g
(0.55 lb)
147 g
(0.32 lb)
krk622en1905h ♦ page 1
Thank you for choosing a NIVELCO instrument!
NIVOCONT K
KRK–622
CONDUCTIVE LEVEL SWITCH
Manufacturer:
NIVELCO Process Control Co.
H–1043 Budapest, Dugonics u. 11.
Tel.: +36-1-889-0100
Fax: +36-1-889-0200
E-mail: sales@nivelco.com
www.nivelco.com
USER’S MANUAL
PDF
KRK–622–
NIVOCONT KS
–
0
Type Code
Cable probe K
SINGLE PROBE
PP socket P
Carbon steel socket S
Stainless steel socket N
MULTIPLE PROBES
Stainless steel socket H
Housing mat. Code
Aluminum 2
Plastic 3
Probe number Code
1 + reference probe* 1*
2 + reference probe 2
3 + reference probe 3
4 + reference probe 4
Power supply Code
230 V AC 1
110 V AC 2
24 V AC/DC 4
2.2 ORDER CODES (NOT ALL CODE VARIATION AVAILABLE)
2.4 DIMENSIONS
2.3 ACCESSORIES
– User’s Manual
– Warranty Card
– EU declaration of conformity
– Seal (2 mm
[0.08"]
thick)
(KLINGER OILIT)
:
1× ⅜" (KSP–201, KSS–201, KSN–201)
1× 1½" (KSH–20
)
– M6 nut (standard SW):
3× (KSH–202)
4× (KSH–203, KSH–204)
– M6 nut (non-st. SW)
1× (KSH–204)
KSK–
201
KSP–
201
KSS–
201
KSN–
201
KSH–
KLN–
2
KLP–
201
KLP–
204
202 203 204 301 302 303 304
Number of probes 1 2+r 3+r 4+r 1+r 2+r 3+r 4+r 1 –
I
nsulation of socket
ABS PP PFA PP –
Cable gland Pg7
(1)
M4 nut,
protected by a rubber cap
M20x1.5
cable diameter Ø6…12 mm
(Ø0.25…0.5 inch)
– –
Process conn. – ⅜" BSP 1½" BSP M6 –
Socket material – PP
A44
c. steel
KO35
stainless steel (1.4571)
PP
KO35
1.4571
–
Housing material –
Powder-coated
cast aluminum
PBT – PP PVDF
Medium
temperature
max. +80 °C
(+176 °F)
max. +200 °C
(+391 °F)
max. +80 °C
(+176 °F)
–
max.
+80 °C
(+176 °F)
max.
+130 °C
(+266 °F)
Max. pressure –
3 bar
(43.5 psi)
16 bar
(232 psi)
3 bar
(43.5 psi)
–
Ingress protection – IP20 IP65 IP67 –
Mass
50 g
(0.11 lb)
100 g
(0.22 lb)
400 g
(0.88 lb)
220 g/m
(0.13 lb/ft)
–
r = reference probe
(1)
cable: Ø4…7 mm
2.1.2 Probe sockets
Pg7
M20x1.5
SW55
⅜" BSP
Switch
KRK–622–
Cable Probe
KSK–201
Probe Socket
KSH–20
Probe Socket
KSP–201 / KSS–201 / KSN–201
Probe
KLN–2
Uninsulated base probe
M20x1.5
85
Probe Socket
KRK–512–
Separator
KLP–204
Probe Socket
KSH–30
Separator
KLP–201
KLN–2
Code Probe length Code
0 0 m 0 m 0
1 1 m
(3.3 ft)
0.5 m
(1.64 ft)
5
2 2 m
(6.6 ft)
3 3 m
(10 ft)
Separator:
NIVOCONT KLP–201 – for plastic version
NIVOCONT KLP–204 – for aluminum version
*only plastic version
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